Equipment Maintenance and Calibration About LabtronX We keep your - PowerPoint PPT Presentation

Water Analysis Equipment Maintenance and Calibration

About LabtronX ▪ We keep your laboratory and monitoring equipment accurate and reliable ▪ Accuracy Assurance Program - Regularly scheduled calibration and maintenance on all your lab equipment and flow meters ▪ We make it easy and guarantee your satisfaction LabtronX 615-831-2554

About Eric Link ▪ Have worked at LabtronX for over 30 years ▪ Became the CEO about 10 years ago ▪ Bought the company from my father about 5 years ago ▪ Married with 6 kids ▪ Love sailing, the Preds, playing guitar, directing and writing plays, and my job. LabtronX 615-831-2554

What we will cover Information Overload Ahead Everything pH What pH is How do we measure pH pH Calibration and Maintenance Calibration and Maintenance Program LabtronX 615-831-2554

What pH is Sorta LabtronX 615-831-2554

What is… WATER? LabtronX 615-831-2554

Water is 2 hydrogen + 1 oxygen molecules . LabtronX 615-831-2554

Water is 2 hydrogen + 1 oxygen molecules . - - Also creates Adhesion + And the ability to dissolve everything! LabtronX 615-831-2554

Natrium LabtronX 615-831-2554

Water is 1 Hydrogen + 1 Hydroxyl molecule. Pure water has a pH of 7 Pure Water is non-conductive Water dissolves everything! LabtronX 615-831-2554

Even dogs dissolve in water!

What Happens? + - + Water Hydrochloric Acid Extra Hydrogen LabtronX 615-831-2554

The ratio of H:OH determines the pH of the solution. For every 10 times the number of one over the other equals one pH unit. LabtronX 615-831-2554

What is pH? ▪ pH is an attempt to measure the ratio of Hydrogen vs. Hydroxyl ions or the negative log of the activity of the hydrogen ion in an aqueous solution. ▪ For each 10 times more H to OH gives you 1pH unit of acid (below 7) ▪ For each 10 times more OH to H gives you 1pH unit of base (above 7) LabtronX 615-831-2554

How do we measure pH Millivolts and Electrodes LabtronX 615-831-2554

LabtronX 615-831-2554

A typical pH Electrode A negative lead (reference) behind a salt junction and a positive lead (pH) behind a glass membrane to read a voltage. LabtronX 615-831-2554

The pH meter reads positive millivolts when solution is below pH 7 (extra H) and Negative mV when it is above pH 7 (extra OH) LabtronX 615-831-2554

pH is backwards or the negative log of Hydrogen activity LabtronX 615-831-2554

Ratio vs. pH Curve 1200 1000:1 1000 800 600 400 100:1 200 10:1 1:1 0 pH7 pH6/8 pH5/9 pH4/10 LabtronX 615-831-2554

SLOPE OF THE ELECTRODE mV 1000:1 177.4 .48 100:1 118.3 .32 10:1 Mil illi livol olts ts / pH unit it % Slo lope pe 59.1 .16 59.16mV 100% 1:1 58.57mV 99% 57.98mV 98% 0 pH7 pH6/8 pH5/9 pH4/10 57.39mV 97% 56.79mV 96% 56.20mV 95% 55.61mV 94% LabtronX 615-831-2554

SLOPE OF THE ELECTRODE Effects of Temperature mV lower mV Temperature does not change the pH, only the pH reading (or slope) 177.4 .48 ATC Probes (Automatic Temperature Compensation) 135 135 compensate for the theoretical change 118.3 .32 in the mV output of the pH electrode as it is effected by temperature 90 90 The further away from 7 59.1 .16 45 45 the more temperature compensation Triode electrodes have pH elements 0 0 pH7 pH6/8 pH5/9 pH4/10 with less surface LabtronX 615-831-2554

pH Calibration and Maintenance What we can check LabtronX 615-831-2554

SLOPE OF THE ELECTRODE Calibration Base Acid pH meters have two curves to be calibrated, 177.4 .48 one positive and one negative. 118.3 .32 Calibrate with a pH7 and at least one other buffer 59.16 .16 to bracket your readings (4 or 10) 0 0 pH7 pH6/8 pH5/9 pH4/10 Check expiration and open dates of buffers -59.1 .16 Once opened, 10 Buffer often fails first -118.3 .32 -177.4 .48 Calibrate once a day… maybe once a shift LabtronX 615-831-2554

Electrode Health Mil illi livol olts ts / pH unit it % Slo lope pe 59.16mV 100% 96% Slope is a warning 58.57mV 99% 57.98mV 98% 94% Slope is when the electrode should be changed 57.39mV 97% in the water and wastewater field. 56.79mV 96% 56.20mV 95% Look for less than 15mV offset at pH7 55.61mV 94% Look for quick response at stable temperatures

Refillable electrode vs. gel-filled Liquid wicks better at reference junction than a gel Filling hole allows better flow at reference junction Warranty is typically twice as long on refillable electrode Gels are known to respond slower and can have pH reading errors earlier LabtronX 615-831-2554

Storage and cleaning electrode Store electrode wet to keep both junctions active Do not use distilled water for storage Using pH buffers can cause errors pH electrode storage solution (Shameless plug - LabtronX makes this right!) Quick clean with toilet bowl cleaner LabtronX 615-831-2554

Checking the Meter BNCs are the most universal input connectors Meters can be checked with a mV generator to confirm accuracy and response Shorting the input connector will give you 0mV (7pH) LabtronX 615-831-2554

Checking the Temperature Digital equipment is precise but may not be accurate Incorrect temperature is more likely to give you a bad slope than a bad reading Using a separate ATC probe gives you more versatility LabtronX 615-831-2554

Too much information? Want some more? Ask a question. LabtronX 615-831-2554

Calibration and Maintenance Programs Risk Management LabtronX 615-831-2554

What is your maintenance policy? If its not broke don’t fix it. If it breaks we’ll get a new one. MacGyver has nothing on us! Patch it up and move on. We’re getting a new plant next year. We have trained personnel who perform and document regular maintenance and calibration LabtronX 615-831-2554

How do you know? How do you know your numbers are right? Accuracy How do you know that they are always right Or that your equipment will be working when you need it? Reliability Regular Calibration and Maintenance LabtronX 615-831-2554

Reasons Equipment Becomes Inaccurate Environmental Changes Consumable Components Temperature, Pressure, Humidity Lightbulbs, Membranes, Glassware Miscalibration Bad Standards, Procedures, or Technique Unstable Systems Power Fluctuations, Discoloration, Changes in Sample Lack of Maintenance or Care Equipment Failure Physical Wear, Dirt, Insects See Next Slide LabtronX 615-831-2554

Reasons Equipment Becomes Unreliable Physical Attacks Over-stressed Components Environmental or Misuse Overuse or Over Limits Error or Mistakes Lack of Knowledge or Information Poor Design, Assembly, or Installation Incorrect Equipment, Components, or Engineering Lack of Maintenance or Care Unimagined Incidents Inconsistent, Reactive, or Limited Accidents, Acts of God, or Sabotage LabtronX 615-831-2554

Setting Your Maintenance Policy Why do it? Identifying Risks What results do you expect? Setting Overall Goal What do you do? Proactive Actions How often do you do it? Cycles of Uncertainty Who does what? Roles and Responsibilities How can you answer these questions? LabtronX 615-831-2554

800-831-2554 ELink@LabtronX.com